Pulley



(No Mode-1'.) 2Sheets-Sheet 1. W. J. GQRHAM 8v M. A. GRAHAM. PULLEY.

No. 414,307. PatentedN ov. 5, 1889..

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(No Model.) 2 Sheets-Sheet 2.

W. J. GORHAM & M. A. GRAHAM.

' PULLEY.

No. 414,307. Patented Nov. 5, 1889.

WITWES INVEJVTUR. W @arZ/a zw/ Attorney UNITED STATES PATENT OFFICE.

\VILLIAH J. GORHAH AND MARCELLUS A. GRAHAM, OF SAN FRANCISCO,

CALIFORNIA.

PU LLEY.

SPECIFICATION forming part of Letters Patent No. 414,307, dated November5, 1889.

Application filed February 11, 1889. Serial No, 299.502. (Ne model.)

To all whom it may concern.-

Be it known that we, \VILLIAM J. GORHAM and MARCELLUS A. GRAHAM, of thecity and county of San Francisco, State of California, have invented anImprovement in Pulleys; and we hereby declare the following to be afull, clear, and exact description of the same.

Our invention relates to an improved c011- struction for pulleys. It ismore especially adapted for use upon small pulleys which receive a beltfrom a much larger one for the purpose of producing high speed, such asare used upon planing-machines, generators for electric-lightingpurposes, and other machinery.

Referring to the accompanying drawings for a more complete explanationof our invention, Figure 1 is a transverse section through the center ofthe pulley. 2 and 3 show modifications of the core-surface.

In the use of very small pulleys it is almost impossible to prevent thebelt from slipping and causing irregular work.

In our invention the pulley is composed mainly of what is known asfibrous stock, which forms the exterior surface and body, and inconnection therewith we employ a spider or core, of iron or other metal,which forms a center, and a peculiar means for uniting the two together.

A is the core or spider, as we term it, which is made of cast-iron orother suitable material. Around the surface the core is formed ofalternate channels and elevations, which may extend from end to end, or,which is preferred, it may have plain grooved or dovetailed channelsaround the circumference, as in Figs. 2 and 3. The adhesion is increasedin the case of plain ridges and grooves by making holes through theelevated ridges, so that the plastic material may pass through, and,uniting with that within the channels, it forms a lock, which willeffectually prevent the loosening of the body from the core. This coreforms ahub, which is bored through with a hole of the proper size to fitthe shaft for which it is designed, and with a keyway or other usualmeans for securing it thereto.

In finishing the pulley we take a compound, which is known to the tradeas fibrous stock, and which consists, approximately, of shoddy or oldrubber, boot, shoe, and coat material ground up, iron filings, litharge,coal-tar, and a small percentage of rubber, with sufficient sulphur toproperly vulcanize the mass. This material is prepared in sheets, and isknown to the trade. \Ve make no claim upon the particular compound.Strips of this material are first laid into the grooves or channels 0,so as to fill them up approximately to the level of the elevations onthe surface of the core. A sheet of the material is then cut so as tojust wrap around the surface of the core, the edges meeting, and a sheetof cloth,canvas, or other suitable fibrous material or wire-cloth isthen wrapped around this first layer of the fibrous stock. Another layerof the fibrous stock is then wrapped around the canvas or otherintermediate coating, and this is again followed by another layer ofcanvas, and so on until the space between the flanges is built up to aproper height, the outer coating being composed of the fibrous stock.The material being thus built up, the whole core and outer casing areplaced within a mold, within which it is closely clamped, the propercrown being given to the surface which is to form the pulley-surfacewhen finished. The whole is then placed in a vulcanizer and vulcanizedin the usual manner of vulcanizing rubber fabric, and the material willpermeate through the intermediate layers of canvas or other material, soas to form a homogeneous body, and it will be firmly secured to themetal core both by reason of the channels and by reason of thevulcanizing, which causes it to adhere strongly to the iron.

The pulley thus built presents a surface- 0 nailing the leather or othercoverings to said strips to retain them in place. Ve do not claim anysuch device.

' Having thus described our invention, What We claim as new, and desireto secure by Letters Patent, is-

1., A pulley consisting of a metal core having its periphery formed Withalternate channels and elevations and having flanges at the ends, and abody composed of alternating fibrous stock and sheets of flexiblematerial fitted upon the core and vulcanized thereto, substantially asdescribed.

2. A pulley consisting of a metal core havinggrooved or dovetailedchannels around its circumference, and alternating elevations and a bodyfitted to said core and consisting of alternating fibrous stock andsheets of flexible material, substantially as described.

In Witness whereof We have hereunto set on r 20 hands.

\VILLIAM J. GORHAM. MARCELLUS A. GRAHAM.

Witnesses:

S. H. NoURsE, H. 0. LEE.

